New York: American Water Works Association, n.d., circa 1950. 15p., comicbook panels in color, a standard format comic but of course an educational one; 10x7 inch self-wraps on newsprint, paperstock is toned, evenly, but except for faintest edgewear a swell copy. This cataloguer may have been the only human to look into its pellucid depths. Ancient Egyptians had a decanting system to beat Nile sediments. Back cover tells the distributor's tale, i.e. "Courtesy of SF Water.." and no, there's no Hetch Hetchy stuff, it's written by New Yorkers.